perl unless循环

概述[oracle@jhoa 6]$ cat 4.pl $mon = $ARGV[0];unless ($mon eq "Feb") {print "This month has at least thirty days.\n";}else {print "Do you see what's going on here?\n";}[oracle@jhoa 6]$ perl 4.pl Fe

[oracle@jhoa 6]$ cat 4.pl $mon = $ARGV[0];unless ($mon eq "Feb") {print "This month has at least thirty days.\n";}else {print "Do you see what's going on here?\n";}[oracle@jhoa 6]$ perl 4.pl Feb Do you see what's going on here?---条件为假时,才执行[oracle@jhoa 6]$ perl 4.pl FebfThis month has at least thirty days.

unless = if not

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